TM 9-4940-568-345-131d.Testing Exciter Rotor.(1)Testing Winding Resistance: Disconnect the six rotor winding leads from the terminal posts on therectifier assembly. With a Wheatstone bridge, measure electrical resistance across each pair of rotorwindings: U (CR1 or CR4) and V (CR2 or CR5), V (CR2 or CR5) and W (CR3 or CR6), W (CR3 orCR6) and U (CR1 or CR4). See the winding schematic. Replace the whole rotor shaft assembly (Para5-21) if the resistance of any winding is not as specified in Table 5-1.(2)Testing Winding Insulation Resistance: Using an ohmmeter, measure the resistance between any rotorwinding lead or the terminal to which it is connected and the rotor laminations. Replace the whole rotorshaft assembly (Para 5-21) if insulation resistance is less than 1 megohm.
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